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如何选择机器学习算法 - 大数据 & AI - 清泛网 - 专注C++内核技术
...aking sure to try different parameters within each algorithm as well), and select the best one by cross-validation. But if you’re simply looking for a “good enough” algorithm for your problem, or a place to start, here are some general guidelines I’ve found to work well over the year...
If using maven, usually you put log4j.properties under java or resources?
... configuration: Run->Run Configurations...->Java Application->New select the Classpath tab, select Advanced and browse to your src/resources directory.
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Sort a list from another list IDs
...; source,
IEnumerable<TId> order,
Func<T, TId> idSelector)
{
var lookup = source.ToDictionary(idSelector, t => t);
foreach (var id in order)
{
yield return lookup[id];
}
}
Is a generic extension for what you want.
You could use the extension li...
How can I trigger a JavaScript event click
...
To repeat the click more than once: Add an ID to the element to uniquely select it:
<a href="#" target="_blank" id="my-link" onclick="javascript:Test('Test');">Google Chrome</a>
and call the .click() method in your JavaScript code via a for loop:
var link = document.getElementById(...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...address as well as unaligned pointer
I've just built that version of gcc from source. For the above program, it produces these diagnostics:
c.c: In function ‘main’:
c.c:10:15: warning: taking address of packed member of ‘struct foo’ may result in an unaligned pointer value [-Waddress-of-...
How to detect if multiple keys are pressed at once using JavaScript?
...g for optimization. This is because the script tag blocks further elements from loading until its script is finished downloading. Putting it ahead of the content allows the content to load beforehand.
B (which is where your interest lies) You can check for one or more keys at a time where /*insert c...
What is the “Execute Around” idiom?
...e Around" idiom (or similar) I've been hearing about?
Why might I use it, and why might I not want to use it?
8 Answers
...
How to make a great R reproducible example
... X73 Class
1 A 266 960 Yes
2 A 373 315 No Notice the selection split
3 A 573 208 No (which can be turned off)
4 A 907 850 Yes
5 B 202 46 Yes
6 B 895 969 Yes <~~~ 70 % of selection is from the top rows
7 B 940 928 No
98 Y 37...
How do I sort an observable collection?
... of the sorted partition from the unsorted. Worst case O(n). Essentially a selection sort (See below for output).
public static void Sort<T>(this ObservableCollection<T> collection)
where T : IComparable<T>, IEquatable<T>
{
List<T> sorted = collectio...
Decimal precision and scale in EF Code First
...mp; t.Namespace == "YOURMODELNAMESPACE"
select t)
{
foreach (var propAttr in classType.GetProperties(BindingFlags.Public | BindingFlags.Instance).Where(p => p.GetCustomAttribute<DecimalPrecisionAttribute>() != null).Select(
p ...